T(n, k) = Sum_{j=1..k} (1 + 2*cos(j*Pi/(k + 1)))^n for n > 0, T(0, 0) = 1. Triangle read by rows, T(n, k) for 0 <= k <= n.

A342911

T(n, k) = Sum_{j=1..k} (1 + 2*cos(j*Pi/(k + 1)))^n for n > 0, T(0, 0) = 1. Triangle read by rows, T(n, k) for 0 <= k <= n.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =0a(4) =1a(5) =4a(6) =0a(7) =1a(8) =8a(9) =15a(10) =0a(11) =1a(12) =16a(13) =35a(14) =54a(15) =0a(16) =1a(17) =32a(18) =83a(19) =134a(20) =185a(21) =0a(22) =1a(23) =64a(24) =199a(25) =340a(26) =481a(27) =622a(28) =0a(29) =1

External references